Meet the 2026 GMC Sierra 3500HD AT4—a heavy-duty workhorse engineered for serious performance and capable hauling. This stunning red diesel truck combines the legendary Duramax 6.6L V8 Turbodiesel engine with a 10-speed automatic transmission and 4WD capability. With only 17,849 miles, this AT4 is virtually new and ready to take on any job with authority.

Key Features:
- Duramax 6.6L V8 Turbodiesel Engine with Dual 220-Amp Primary & 170-Amp Auxiliary Alternators
- 10-Speed Automatic Transmission with 4WD
- AT4 Premium Plus Package for enhanced capability and design
- Gooseneck/5th Wheel Prep Package with Trailer Camera Provisions
- Power-Retractable Assist Steps in Black
- Hitch Package with Hitch Guidance and Hitch View
- Engine Block Heater and High Idle Switch for reliability
- Heated and Ventilated Front Leather Seats with 10-Way Power Adjustment
- 15-Inch Multicolor Head-Up Display with Premium 13.4-Inch Information Screen
- Premium Bose 7-Speaker Audio System with SiriusXM 360L and Wireless Phone Projection

This truck is built for the professional who demands excellence. The AT4 designation brings exclusive styling with gloss black grille accents, LED smoked amber roof marker lamps, and 20-inch high-gloss black aluminum wheels. Inside, you'll find heated and ventilated front seats, a heated steering wheel, and comprehensive safety technology including automatic emergency braking, forward collision alert, and surround vision cameras.

Visit us today to experience the power, capability, and refinement of this exceptional Sierra 3500HD AT4.